<style>

.ft{
  position: relative;
  width:100%;
  height:100%;
  text-align:center;
}
.ft span{
    display:inline-block;
    margin-top:30px;
    font-size:12px;
    color:gray;
}
</style>

<html>
    <div class="ft">
           <span>
                  XXX网安备00000000号   无ICP证000000号©2021 
           </span>
    </div>
</html>
<script>

var app=new Eng({
      id:'foot',
      el:html,
      css:css,
      parent:parentDom,

});


</script>